#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int ans = 0;
	for(int i = 1;i <= n;i++)
		for(int j = 1;j <= n;j++)
			for(int k = 1;k <= n;k++)
			{
				if((i+j) % 2 == 0 && (j+k) % 3 == 0 && (i+j+k) % 5 == 0)
					ans = max(ans, i+j+k);
			}
	cout<<ans;
	cout<<endl;
	system("pause");
	return 0;
}

